<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .age{
            font-size: 18px;
            color: red;
        }
        #name{
            font-size: 22px;
            color: blue;
        }
        h2{
            font-size: 30px;
            color: pink;
        }
    </style>
</head>
<body>
    <span class="age">我是div1</span><br>
    <span>我是div2</span><br>
    <span>我是div3</span><br>
    <p>我是段落p1</p>
    <p>我是段落p2</p>
    <p id="name">我是段落p3</p>
    <h4>我是标题h4</h4>
    <h2>我是标题h2</h2>
</body>
</html>